308 Tapeworms of Poultry 
on the posterior find ventral surface of the segment and. is surrounded, on all 
sides except the posterior by the narrow unlobed ovary (ov.). 
When fully developed, the receptaculum seminis ( r.s.) extends from the 
ventral longitudinal excretory vessel to a little over half-way across the 
segment. It is slightly funnel-shaped, the inner end being rather larger than 
the outer. The uterus (u.) in its early stages is a long narrow sac twisted upon 
itself so that its cavity appears to be divided by septa. Later it increases in 
size and occupies the whole of the proglottis, extending past the excretory 
vessel as far as the cuticula. At this stage the proglottis is a mere egg-sac, 
but with no communication with adjacent segments. As was the case with 
other observers, no mature eggs could be found. 
HYMENOLEPIS GRACILIS (Zeder, 1803). 
The specimens of this species were obtained from the intestine of domestic 
ducks, Rangoon, and sections confirm Wolffhugel’s account. The following 
additional points were noticed. The genital pore (PI. XVI, fig. 3, g.p.) is 
extremely anterior, in the anterior quarter of the proglottis margin, and is 
often covered by the overlapping of the preceding segment. The cirrus-sac 
(c.s.) does not, as Liihe (1910, p. 61) states, barely reach the centre 
line of the proglottis, but extends well past it, nearly to the aporal longitu¬ 
dinal excretory vessel. The testes (t.) are arranged as Fuhrmann (1906 6, 
p. 733) states, one poral and two aporal; of the latter the one is always external 
and anterior to the other. As stated by other investigators no transverse 
commissures could be traced between the longitudinal excretory \essels of 
opposite sides. A large number of minute branches are given off during their 
course, particularly in the neighbourhood of the posterior margin of the pro- 
glottis and as these latter branches penetrate some distance into the segment 
and could often be traced half-way across it, it is a reasonable supposition 
that through them the opposite excretory vessels communicate. 
REFERENCES. 
Diamare, V. (1893). Note su’ Cestodi. Boll. Soc. Nat. Napoli. Ser. 1. vn. 9. 
Dujardin, F. (1845). Histoire naturelle des Helminthes, ou vers intestinaux. Paris. 
Fuhrmann, O. (1906, a). Die Hymenolepis Arten der Vogel. Centrbl. Bald. Abt. 1, Orig., 
xli. 440-452. 
- (1906, b). Die Hymenolepis Arten der Vogel. Ibid. xlii. 620-628. 
- (1909). Neue Davaineiden. Ibid, x lix. 116-122. 
Gough, L. H. (1911). A monograph of the tapeworms of the subfamily Avitellininae, 
being a revision of the genus Stilesia, and an account of the histology of Avitelliua 
centripunctata (Riv.). Quart. Journ. Micr. Sci., n. s. lvi. 317. 
Khitrow, M. S. (1900). Sur la presence de la Cotugnia digonophora a Kharkov et de son 
parasite ver rond. Trudui Kharkov TJniv., xxxv. 27. 
Krabbe, H. (1869). Bidrag til Kundskab om Fuglenes Baendelorme. Kgl. Dansk. Vidensk. 
Selsk. Skrift., R. 5. Naturvid. og math. Afd. 8, vi. 
Linstow, O. v. (1905). Helminthen der Russischen Polar-Expedition 1900-1903. Mem. 
Acad. Imp. Sci., Petrograd, Ser. vm. Cl. Phys.-Math., xvm. 
